Summary of Weighted-Average Estimated Fair Value of Warrant Issued With Convertible Note (Detail)	12 Months Ended
Dec. 31, 2012
Warrant Issue Price 0.81 Per Share
Disclosure Weighted Average Estimated Fair Value Of Warrant Issued With Convertible Note [Line Items]
Expected volatility	133.00%
Risk-free interest rate	0.36%
Expected life	3 years
Dividend yield	0.00%
Warrant Issue Price 0.62 Per Share
Disclosure Weighted Average Estimated Fair Value Of Warrant Issued With Convertible Note [Line Items]
Expected volatility	128.00%
Risk-free interest rate	0.31%
Expected life	2 years
Dividend yield	0.00%

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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